Information about False Elm:

The Celtis Occidentalis is commonly known as the American Hackberry, Beaverwood, Common Hackberry, False Elm, Hackberry, Nettletree, Northern Hackberry as well as Sugarberry.

The fully documented scientific name of hackberry is Celtis occidentalis
L. The taxonomy presented here follows that of the Great Plains Flora
Association which designates three varieties of this species in the
Great Plains. Apparently the variation encountered within the species
makes recognition of these varieties difficult. Fully documented names
of the hackberry varieties encountered in the literature are presented
below .
Celtis occidentalis var. crassifolia (Lam.) Gray
Celtis occidentalis var. pumila (Pursh) A.Gray
Celtis occidentalis var. canina (Rafl) Sarg.

Hackberry is widely distributed in the eastern United States from
northwest Minnesota to central Wisconsin and Michigan into central New
York and throughout the southern New England states. It is found as far
south as northern Georgia, Alabama, northeastern Mississippi and central
Arkansas. This species' range extends west through central Oklahoma,
and includes most of Kansas, Nebraska, South Dakota and eastern North
Dakota . Hackberry also grows along the Arikaree river in eastern
Colorado . In Canada hackberry is local in the extreme southern
reaches of Manitoba, Quebec and Ontario . The exact southern part
of its range is difficult to establish because of hackberry's similarity
to sugarberry (C. laevigata) .

Hackberry is a documented member of two plant communities in the western
extension of its range. It is listed as an associated species of the
green ash (Fraxinus pennsylvanica)/western snowberry (Symphoricarpos
occidentalis) plant communities in Nebraska and in the Black Hills
National Forest of South Dakota, and in the plains cottonwood (Populus
sargentii)/western snowberry plant communities in central Montana,
southwestern North Dakota, southcentral South Dakota and Thunder Basin
National Grassland of Wyoming . No published classification schemes
were encountered for the eastern extension of hackberry's range.